Which colors human eye Cannot see?

Red-green and yellow-blue are the so-called "forbidden colors." Composed of pairs of hues whose light frequencies automatically cancel each other out in the human eye, they're supposed to be impossible to see simultaneously. The limitation results from the way we perceive color in the first place.

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What is the rarest color of hair?

Red hair is the rarest natural hair color. Experts estimate that somewhere between 1-2% of the world's population has red hair. Red hair is more common in Scotland than anywhere else in the world, where 13% of the population are redheads. Red hair is known for the variance of its many shades. Then, what is a legendary color? Legendary is a soft, gray, millennial beige with a silvery undertone. It is a perfect paint color for a living room or exterior home.

Keeping this in consideration, what happens if you touch a rainbow?

In short, you can touch someone else's rainbow, but not your own. A rainbow is light reflecting and refracting off water particles in the air, such as rain or mist. If you move from the position where you saw the rainbow to a different position, you will see a different rainbow, reflected from different water drops. One may also ask what is a full rainbow called? The circular rainbows are called as Glory. A glory is an optical phenomenon which is caused by sunlight or moonlight nteracting with the tiny water droplets. The glory consists of one or more concentric, successively dimmer rings, each of which is red on the outside and bluish towards the centre.

Also, is it possible to touch a rainbow?

No you cannot touch a rainbow because it's not a physical object, but rather it's a reflection, refraction and dispersion of sunlight inside water droplets in the atmosphere. The cause of the rainbow may be by many forms of water in the air like rain, mist, spray, and airborne dew etc.